79e917d117
The previous handling for guard widening in InstCombine was extremely restrictive. In particular, it didn't handle the common case where we had two guards separated by a single icmp. Handle this by scanning through a small fixed window of instructions to find the next guard if needed. Differential Revision: https://reviews.llvm.org/D46203 llvm-svn: 331935
111 lines
4.4 KiB
LLVM
111 lines
4.4 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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declare void @llvm.experimental.guard(i1, ...)
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define void @test_guard_adjacent_same_cond(i1 %A) {
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; CHECK-LABEL: @test_guard_adjacent_same_cond(
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %A) [ "deopt"() ]
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; CHECK-NEXT: ret void
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call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
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call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
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call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
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call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
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call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
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call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
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call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
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call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
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call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
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call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
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ret void
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}
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define void @test_guard_adjacent_diff_cond(i1 %A, i1 %B, i1 %C) {
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; CHECK-LABEL: @test_guard_adjacent_diff_cond(
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; CHECK-NEXT: %1 = and i1 %A, %B
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; CHECK-NEXT: %2 = and i1 %1, %C
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %2, i32 123) [ "deopt"() ]
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; CHECK-NEXT: ret void
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call void(i1, ...) @llvm.experimental.guard( i1 %A, i32 123 )[ "deopt"() ]
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call void(i1, ...) @llvm.experimental.guard( i1 %B, i32 456 )[ "deopt"() ]
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call void(i1, ...) @llvm.experimental.guard( i1 %C, i32 789 )[ "deopt"() ]
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ret void
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}
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; This version tests for the common form where the conditions are
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; between the guards
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define void @test_guard_adjacent_diff_cond2(i32 %V1, i32 %V2) {
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; CHECK-LABEL: @test_guard_adjacent_diff_cond2(
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; CHECK-NEXT: %1 = and i32 %V1, %V2
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; CHECK-NEXT: %2 = icmp slt i32 %1, 0
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; CHECK-NEXT: %and = and i32 %V1, 255
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; CHECK-NEXT: %C = icmp ult i32 %and, 129
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; CHECK-NEXT: %3 = and i1 %2, %C
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %3, i32 123) [ "deopt"() ]
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; CHECK-NEXT: ret void
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%A = icmp slt i32 %V1, 0
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call void(i1, ...) @llvm.experimental.guard( i1 %A, i32 123 )[ "deopt"() ]
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%B = icmp slt i32 %V2, 0
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call void(i1, ...) @llvm.experimental.guard( i1 %B, i32 456 )[ "deopt"() ]
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%and = and i32 %V1, 255
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%C = icmp sle i32 %and, 128
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call void(i1, ...) @llvm.experimental.guard( i1 %C, i32 789 )[ "deopt"() ]
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ret void
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}
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; Might not be legal to hoist the load above the first guard since the
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; guard might control dereferenceability
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define void @negative_load(i32 %V1, i32* %P) {
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; CHECK-LABEL: @negative_load
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; CHECK: @llvm.experimental.guard
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; CHECK: @llvm.experimental.guard
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%A = icmp slt i32 %V1, 0
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call void(i1, ...) @llvm.experimental.guard( i1 %A, i32 123 )[ "deopt"() ]
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%V2 = load i32, i32* %P
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%B = icmp slt i32 %V2, 0
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call void(i1, ...) @llvm.experimental.guard( i1 %B, i32 456 )[ "deopt"() ]
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ret void
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}
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define void @deref_load(i32 %V1, i32* dereferenceable(4) %P) {
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; CHECK-LABEL: @deref_load
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; CHECK-NEXT: %V2 = load i32, i32* %P, align 4
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; CHECK-NEXT: %1 = and i32 %V2, %V1
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; CHECK-NEXT: %2 = icmp slt i32 %1, 0
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %2, i32 123) [ "deopt"() ]
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%A = icmp slt i32 %V1, 0
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call void(i1, ...) @llvm.experimental.guard( i1 %A, i32 123 )[ "deopt"() ]
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%V2 = load i32, i32* %P
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%B = icmp slt i32 %V2, 0
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call void(i1, ...) @llvm.experimental.guard( i1 %B, i32 456 )[ "deopt"() ]
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ret void
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}
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; The divide might fault above the guard
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define void @negative_div(i32 %V1, i32 %D) {
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; CHECK-LABEL: @negative_div
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; CHECK: @llvm.experimental.guard
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; CHECK: @llvm.experimental.guard
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%A = icmp slt i32 %V1, 0
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call void(i1, ...) @llvm.experimental.guard( i1 %A, i32 123 )[ "deopt"() ]
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%V2 = udiv i32 %V1, %D
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%B = icmp slt i32 %V2, 0
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call void(i1, ...) @llvm.experimental.guard( i1 %B, i32 456 )[ "deopt"() ]
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ret void
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}
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; Highlight the limit of the window in a case which would otherwise be mergable
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define void @negative_window(i32 %V1, i32 %a, i32 %b, i32 %c, i32 %d) {
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; CHECK-LABEL: @negative_window
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; CHECK: @llvm.experimental.guard
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; CHECK: @llvm.experimental.guard
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%A = icmp slt i32 %V1, 0
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call void(i1, ...) @llvm.experimental.guard( i1 %A, i32 123 )[ "deopt"() ]
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%V2 = add i32 %a, %b
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%V3 = add i32 %V2, %c
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%V4 = add i32 %V3, %d
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%B = icmp slt i32 %V4, 0
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call void(i1, ...) @llvm.experimental.guard( i1 %B, i32 456 )[ "deopt"() ]
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ret void
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}
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